linux-kernel - [PATCH v3 27/59] x86/softirq: Move softirq pending next to current task

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Date:   Thu, 15 Sep 2022 13:11:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org, x86@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Juergen Gross <jgross@...e.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v3 27/59] x86/softirq: Move softirq pending next to current task

From: Thomas Gleixner <tglx@...utronix.de>

Another hot variable which is strict per CPU and benefits from
being in the same cache line.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/include/asm/current.h |    1 +
 arch/x86/include/asm/hardirq.h |    3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -19,6 +19,7 @@ struct pcpu_hot {
 			int			cpu_number;
 			unsigned long		top_of_stack;
 			void			*hardirq_stack_ptr;
+			u16			softirq_pending;
 #ifdef CONFIG_X86_64
 			bool			hardirq_stack_inuse;
 #else
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -3,9 +3,9 @@
 #define _ASM_X86_HARDIRQ_H
 
 #include <linux/threads.h>
+#include <asm/current.h>
 
 typedef struct {
-	u16	     __softirq_pending;
 #if IS_ENABLED(CONFIG_KVM_INTEL)
 	u8	     kvm_cpu_l1tf_flush_l1d;
 #endif
@@ -60,6 +60,7 @@ extern u64 arch_irq_stat_cpu(unsigned in
 extern u64 arch_irq_stat(void);
 #define arch_irq_stat		arch_irq_stat
 
+#define local_softirq_pending_ref       pcpu_hot.softirq_pending
 
 #if IS_ENABLED(CONFIG_KVM_INTEL)
 static inline void kvm_set_cpu_l1tf_flush_l1d(void)